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11.
N. Jayanthi Bai M. Ramachandra Pai P. Suryanarayan Murthy T. A. Venkitasubramanian 《Journal of biosciences》1981,3(4):323-332
An aldolase was partially purified from fermenter grownMycobacterium tuberculosis H37Rv cells. The aldolase has a molecular weight of 150,000, possesses a tetrameric structure and cleaves both fructose diphosphate
and fructose-1-phosphate, the former being cleaved 17 times faster. The enzyme was inactivated by treatment with NaBH4 in the presence of fructose diphosphate or dihydroxyacetone, phosphate suggesting Schiff base formation during its catalytic
function. Thiol reagents, EDTA and metal ions had no apparent effect on the aldolase activity. These results show that aldolase
is of Class I type. However, this enzyme, unlike the mammalian Class I aldolase, was unaffected by carboxypeptidase A. N-ethylmaleiniide
and dithionitrobenzoic acid. 相似文献
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13.
Viswanathan Natarajan William M. Scribner Suryanarayana Vepa 《Chemistry and physics of lipids》1996,80(1-2)
Activation of phospholipase D (PLD) represents part of an important signalling pathway in mammalian cells, Phospholipase D catalyzed hydrolysis of phospholipids generates phosphatidic acid (PA) which is subsequently metabolized to lyso-PA (LPA) or diacylglycerol (DAG). While DAG is an endogenous activator of protein kinase C (PKC), PA and LPA have been recognized as second messengers as well, Activation of PLD in response to an external stimulus may involve PKC, Ca2+, G-proteins and/or tyrosine kinases. In this review, we will address the role of protein tyrosine phosphorylation in growth factor-, agonist- and oxidant-mediated activation of PLD. Furthermore, a possible link between PKC, Ca2+, G-proteins and tyrosine kinases is discussed to indicate the complexity involved in the regulation of PLD in mammalian cells. 相似文献
14.
Sachidanandam Azhagiri Govindaswamy Ranganathan Ramkumaar Suryanarayan Jayakumar Subramanian Kumaresan Ramadoss Arunbalaji Sethu Gunasekaran Shanmugam Srinivasan 《Journal of molecular modeling》2010,16(1):87-94
The FTIR spectrum of 2-nitroaniline was recorded in the regions 4000–400 cm−1. The optimized molecular geometry, bond orders, atomic charges, harmonic vibrational wave numbers and intensities of vibrational
bands of 2-nitroaniline and its cation were calculated at DFT levels invoking two different basis sets 6-31G** and 6-31+G**
using Gaussian 03W program. The X-ray geometry and FTIR vibrational frequencies were compared with the results of DFT calculations.
The thermal stability of 2NA is studied by the thermo gravimetric analysis (TGA). Experimental degradation process of 2-nitroaniline
was interpreted with the bond order analysis. The Mulliken atomic charge analysis was also made in the present study. Based
on the molecular geometry and Mulliken charge analysis, intra molecular hydrogen bonding was identified. 相似文献